{"id":"CVE-2026-85818","title":"Improper verification of cryptographic signature in Windows Schannel allows an unauthorized attacker to perform spoofing over a network.","summary":"Improper verification of cryptographic signature in Windows Schannel allows an unauthorized attacker to perform spoofing over a network.","severity":"critical","cvss":9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","cwe":["CWE-347"],"vendor":"microsoft","product":"windows_11_23h2","affected":["windows_11_23h2 < 10.0.22631.7652","windows_11_24h2 < 10.0.26100.9711","windows_11_25h2 < 10.0.26200.9711","windows_11_26h1 < 10.0.28000.3231","windows_11_26h2 < 10.0.26300.9711","windows_server_2022 < 10.0.20348.5761","windows_server_2025 < 10.0.26100.33650"],"patched":["windows_11_23h2 10.0.22631.7652","windows_11_24h2 10.0.26100.9711","windows_11_25h2 10.0.26200.9711","windows_11_26h1 10.0.28000.3231","windows_11_26h2 10.0.26300.9711","windows_server_2022 10.0.20348.5761","windows_server_2025 10.0.26100.33650"],"published":"2026-10-13","updated":"2026-10-16","sourceUpdated":"2026-10-16T19:58:02.273","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-85818","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85818","label":"secure@microsoft.com"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-13T22:16:24.873537Z"},"epss":0.00414,"epssPercentile":0.35543,"ingestedAt":"2026-10-13T19:43:29.173Z","slug":"CVE-2026-85818","body":"## Overview\n\nImproper verification of cryptographic signature in Windows Schannel allows an unauthorized attacker to perform spoofing over a network.\n\n## Affected\n\n- `windows_11_23h2 < 10.0.22631.7652`\n- `windows_11_24h2 < 10.0.26100.9711`\n- `windows_11_25h2 < 10.0.26200.9711`\n- `windows_11_26h1 < 10.0.28000.3231`\n- `windows_11_26h2 < 10.0.26300.9711`\n- `windows_server_2022 < 10.0.20348.5761`\n- `windows_server_2025 < 10.0.26100.33650`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `windows_11_23h2 10.0.22631.7652`\n- `windows_11_24h2 10.0.26100.9711`\n- `windows_11_25h2 10.0.26200.9711`\n- `windows_11_26h1 10.0.28000.3231`\n- `windows_11_26h2 10.0.26300.9711`\n- `windows_server_2022 10.0.20348.5761`\n- `windows_server_2025 10.0.26100.33650`","depth":"midnight","depthScore":50,"depthScoreParts":{"impact":49.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}